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Science & Space

The most popular blog posts about science & space on Hacker News. 422 posts.

2025
94

CERN scientists find evidence of quantum entanglement in sheep

Update: did you enjoy our April Fool’s day story? While sheep do roam the CERN site and exhibit interesting flocking behaviour, no evidence has been found of their quantum entanglement (yet). However, CERN is participating in the International Year of Quantum Science and Technology . You can see the list of public…

95

NIST was 5 μs off UTC after last week's power cut

If you were 5 microseconds late today, blame it on NIST. Their facility in Boulder Colorado just had its power cut for multiple days. After a backup generator failed, their main ensemble clock lost track of UTC, or Universal Time Coordinated. But even if you used the NTP timing servers they run, they were never off by…

114

What Is Entropy?

People say many things about entropy: entropy increases with time, entropy is disorder, entropy increases with energy, entropy determines the arrow of time, etc.. But I have no idea what entropy is, and from what I find, neither do most other people. This is the introduction I wish I had when first told about entropy…

120

Solar Orbiter gets world-first views of the Sun's poles

Thanks to its newly tilted orbit around the Sun, the European Space Agency-led Solar Orbiter spacecraft is the first to image the Sun’s poles from outside the ecliptic plane. Solar Orbiter’s unique viewing angle will change our understanding of the Sun’s magnetic field, the solar cycle and the workings of space…